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IFN-γ responses upon experimental inoculation of calves with M. bovis (n = 5), M. tuberculosis (n = 5), or M. kansasii (n = 4). Data are presented as optical densities (means ± SEMs) at 450 nm of the response to M. bovis PPD minus the response to no antigen (ΔIFN-γ). *, the response was significantly different (P < 0.5) from the responses by the M. bovis- and M. tuberculosis-inoculated animals at the same time point.
